The New York Times has an interesting writeup of a growing new trade built around services commonly used as smartphone apps: Music-tracking, or music-identifying services. You've probably played with Pandora or Shazam on your iPhone already, and the article profiles just how all of that music gets tracked down and identified for your listening pleasure. A surprising amount of it is still done simply by human hands. While everything is still fed into the system, obviously (computers do have to know what the music is and what
